The Stovebolt Site Forums The Shop Area Engine Shop Duel carbs Manuel choke

52 Chevy truck 57 235 engine I installed a Fenton duel carb manifold Rochester carbs Fenton headers
Anyone have experience with Manuel choke?
I left mine on the 2nd carb should I put it on the 1st carb ? Started the truck this weekend didn’t start til I put fuel in the carbs
Any experience much appreciated

You've got one of each- - - - -too many carbutetors, or not ernough chokes. Splitting the air flow through two carbs will reduce the vacuum you can develop by closing only one choke plate. Normally, closing the choke allows the manifold vacuum created by cranking to pull gas through all the passages in the carburetor. If choking only one carb allows a cold engine to start, that carb is jetted WAAAYYYYY too rich.
Jerry

Chokes on both!

Agree with Jerry on the too rich if a cold engine will start on just one when the weather is cold.

Plus, the choke butterfly IMPROVES low engine RPM performance, as it acts as a straightening vane to improve air velocity into the carburetor.

Jon.

I have done it both ways and agree with the others. You want chokes on both carbs. Makes life a little easier starting on a cold day.

"chokes on both carbs"

Thank you, Jon
Thank you, Mike

That has been my experience with the 1960 261 on my 1954 Suburban, when I had two-216 versus two-235 carbs.

However, that old 261 now has a 2-barrel AA1 Holley Carburetor with adjustable jets. It (the carb) can be easily adjusted to idle nicely at very low RPM.

And, that 261 3106 can now easily/smoothly accelerate from standing-still to illegal speeds very nicely/impressively/quickly.

Thanks for reply’s I could add a second choke where the throttle cable is.
As an old stovebolter (DENNIS) would say it’s just being grumpy.
Thanks Robert

Iatroca 52 Have a fenton dual carb propane set-up with no chokes at all fires-up in the cold is never cold natured don't have to fight it out the drive way. It lugs fine and is not short on power. you can buy it all on Amazon ! Fuel is .89 cents before motor fuel tax ! No use of fighting that sorry liquid fuel !!

Wow sounds like an interesting set up

Hope you have hardened valve seats.

Jon.

True.
Propane is very "dry" and (unlike petroleum-based fuels, but like ethanol & methanol) provides no lubrication to the seats.
Klotz Uplon added to the gas may help.

Carbking Do have hard seats.got them from Goodson's ran em a long time,then called for more, they said dont use those with propane ! Well there still running . These trucks use the most common exhaust valve on earth,I use the valves with the hard button, what used to be sealed power 1003x. Goodsons sent me to another outfit for seats and they were reasonable . Nice to get your seats back up where you can get spring tension again. I dont think those seats are going to be bothered by propane.

panic propane isn't dry it just doesn't wash oil away lke gasoline does,that is why your cylinders and rings last so much better.now as for exhaust valves they microscopically weld to the seat and erode it away because of no carbon to pad them. Seats are an easy fix, needed with no-lead too ! heads with induction hardened seats will work,but once ground are susceptible too ! most of the 235 heads I see have the guides knurled,and seats are deep , new guides,hard seats and hard button valves will give these heads a new life. I give them a 3 angle seat with about a .060 seat width ground at 46 degrees with a 45 degree valve.

panic Just replied to you==poof its gone???

There's too many machining mistakes in that post to address individually!
Jerry

panic Replied to you earlier but poof disappeared-should surface now !

panic What is Klotz Uplon ??

Carbking do have hard seats,use valves with the hard button.

If anyone is seriously thinking of doing a propane conversion for the FIRST time, give me a call.

James Wan could win an oscar for a movie about propane conversions!

One might also consider:

Energy:

87 octane regular 116,700 BTU/gallon
87 octane E10 111,730 BTU/gallon
propane 91,500 BTU/gallon

Octane (AKI):

87 octane regular - 87 AKI
propane 104.5 AKI

And what is the compression ratio of a stovebolt???

Also, costs:

Missouri has a propane vehicle license fee, in addition to the normal vehicle license fee, for vehicles using propane for propulsion. Check your own state laws.

Jon.

I worked in the maintenance shop for a California company that ran a bunch of LP gas powered equipment, including the company owner's cars and a couple of pickups and service trucks. If I never see one of those rigs again, it will be about three days too soon! They're a royal PITA to work on, and underpowered to boot!
Jerry

PS: What does Manuel charge to operate the choke plates while he's dueling with the carbs?????????

panic what is klotz uplon ??